Yes, yes they do. I have owned one for like 3 months, and the trackball has stopped working. I've tried cleaning it. Also the laser is slower, and the connectivity is weaker.

That's why I'm going to Best Buy today to hopefully pick up a Logitech V470, and maybe a colour printer. (We have a black and white laser)

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rly cause i had my mighty since 07 and i yes sometimes the scroll-ball gets stuck but all u have to do is hold the mouse upside down and use a dry paper towel or somthing and just rub it back and fourth(lolz) until it works agian